Noise abatement method and apparatus



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NOISE ABATEMENT METHOD AND APPARATUS Filed June 4, 1963 23 Sheets-Sheet 1 6 g 20 I. a

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NOISE ABATEMENT METHOD AND APPARATUS 23 Sheets-Sheet 15 July 13, 1965 Filed June 4, 1963 y 1965 J. M. TYLER ETAL 3,194, 87

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NOISE ABATEMENT METHOD AND APPARATUS Filed June 4, 1963 23 Sheets-Sheet 17 FIC5-4I DEC/5628 July 13, 1965 J. M. TYLER ETAL NOISE ABATEMENT METHOD AND APPARATUS 23 Sheets-Sheet 18 Filed June 4, 1963 July 13, 1 J. M. TYLER ETAL NOISE ABATEMENT METHOD AND APPARATUS 23 Sheets-Sheet 19 Filed June 4. 1963 qv mUTu July 13, 1 J. M. TYLER ETAL NOISE ABATEMENT METHOD AND APPARATUS 25 Sheets-Sheet 20 Filed June 4, 19615 @V UFm 

1. IN AN AXIAL COMPRESSOR LOCATED WITHIN A FLUID FLOW CONFINING AND WHICH DEVELOPS NOISE CREATING SPINNING MODES DUE TO INTERACTION BETWEEN STATOR VANES AND ROTOR BLADES, THE METHOD OF REDUCING THE STRENGTH OF THE NOISE CREATING SPINNING MODES COMPRISING POSITIONING A FIXED STATOR WITHIN THE DUCT WHICH STATOR HAS A PRESELECTED NUMBER OF STATIONARY VANES AROUND THE PERIPHERY THEREOF, SUPPORTING A ROTOR FOR ROTATION WITHIN THE DUCT WHICH ROTOR HAS A PRESCRIBED NUMBER OF BLADES AROUND THE PERIPHERY THEREOF AND WITH THE BLADES OF THE ROTOR BEING OF DIFFERENT NUMBER FROM THE VANVES OF THE STATOR THEREBY DEVELOPING NOISE CREATING SPINNING MODES DUE TO INTERACTION BETWEEN THE STATIONARY VANES AND THE ROTATING BLADES, AND POSITIONING THE ROTOR TO ABOUT FIVE CHORD LENGSHT FROM THE STATOR TO REDUCE THE STRENGTH OF THE INTERACTION BETWEEN SPINNING MODES SO DEVELOPED AS TO REDUCE THE NOISE. 